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Non-magnetic alloy material for valve seat of ball valve

A non-magnetic alloy and valve seat technology, applied in the field of alloy materials, can solve the problems of non-wear-resistant grain wear, damaged valves, low strength and fragility, etc., and achieve the effect of meeting the wear demand

Inactive Publication Date: 2019-04-16
广汉鸿达硬质合金有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Cemented carbide has magnetic properties, and there are defects under special working conditions. For example, when there are magnetic impurities in the medium, the impurities will be adsorbed on the valve seat, affecting the sealing performance of the valve, and even damaging the valve.
Silicon carbide material is non-magnetic and has high hardness, but its strength is low and brittle, and it is not wear-resistant, so it cannot be used on valves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Ball valve seat non-magnetic alloy material

[0024] By mass percentage, 12%Ni, 4.5%Cr 3 C 2 , 2.5% Mo, and the balance of WC powders are mixed and milled in a ball mill for 48 hours with a ball-to-material ratio of 3:1. During grinding, 2L of alcohol is added per kilogram of metal powder mixture as a ball milling medium. The ball-milled powder is then dried under vacuum to evaporate the alcohol. Add SD resin as a molding agent to the dry powder, the amount of SD resin added accounts for 8% of the powder mass, so that the powder has the ability to be pressed, and is sieved with 80 meshes to make it into granules. Molded by a hydraulic press, sintered into a green body in a vacuum sintering furnace, wherein the sintering temperature is 1460°C, the sintering time is 12 hours, and the vacuum degree is less than 20Pa.

[0025] The non-magnetic alloy material of the ball valve seat prepared in this embodiment strictly controls the content of each component and the prepara...

Embodiment 2

[0029] Ball valve seat non-magnetic alloy material

[0030] By mass percentage, 12%Ni, 0.5%Cr 3 C 2 , 0.5% Mo, and the balance of WC powders are mixed and milled in a ball mill for 48 hours with a ball-to-material ratio of 3:1. During grinding, 2L of alcohol is added per kilogram of metal powder mixture as a ball milling medium. The ball-milled powder is then dried under vacuum to evaporate the alcohol. Add SD resin as a molding agent to the dry powder, the amount of SD resin added accounts for 8% of the powder mass, so that the powder has the ability to be pressed, and is sieved with 80 meshes to make it into granules. Molded by a hydraulic press, sintered into a green body in a vacuum sintering furnace, wherein the sintering temperature is 1460°C, the sintering time is 12 hours, and the vacuum degree is less than 20Pa.

[0031] The magnetic permeability of the cemented carbide material of the ball valve seat prepared in this embodiment is less than or equal to 3.6×10 at r...

Embodiment 3

[0034] Ball valve seat non-magnetic alloy material

[0035] By mass percentage, 12%Ni, 10%Cr 3 C 2 , 5% Mo, and the balance of WC powders are mixed and milled in a ball mill for 48 hours with a ball-to-material ratio of 3:1. During grinding, 2L of alcohol is added per kilogram of metal powder mixture as a ball milling medium. The ball-milled powder is then dried under vacuum to evaporate the alcohol. Add SD resin as a molding agent to the dry powder, the amount of SD resin added accounts for 8% of the powder mass, so that the powder has the ability to be pressed, and is sieved with 80 meshes to make it into granules. Molded by a hydraulic press, sintered into a green body in a vacuum sintering furnace, wherein the sintering temperature is 1460°C, the sintering time is 12 hours, and the vacuum degree is less than 20Pa.

[0036] The magnetic permeability of the cemented carbide material of the ball valve seat prepared in this embodiment is ≤4.8×10 at normal temperature -6 H / ...

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Abstract

A non-magnetic alloy material for a valve seat of a ball valve is characterized by being prepared from the chemical components of, by mass, 12% of Ni, 0.5-5% of Cr3C2, 0.5-5% of Mo, and the balance WCand inevitable impurities. The non-magnetic hard alloy material is nonmagnetic and has no magnetic conductivity, and thus the valve seat does not attract metal impurities in the using process. The non-magnetic alloy material has the characteristics of high strength, high hardness and high abrasion resistance and can meet the requirement for abrasion resistance.

Description

technical field [0001] The invention belongs to the field of alloy materials, in particular to a non-magnetic alloy material for a ball valve seat. Background technique [0002] The valve is a pipeline accessory used to open and close the pipeline, control the flow direction, adjust and control the parameters (temperature, pressure and flow) of the conveying medium. The working environment of the valve is diverse and harsh, and the requirements for the material are very high. Currently, the valve is used There are many kinds of alloy steel, and the technology has made great progress, but there are still many problems, such as wear resistance, hardness, rust resistance, corrosion resistance, high and low temperature resistance, brittleness, toughness, etc., which cannot be solved in many occasions. To meet the requirements of production, further improvement is needed to improve production efficiency, reduce costs, improve safety, provide guarantee for the development of high-...

Claims

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Application Information

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IPC IPC(8): C22C29/08C22C1/05C22C1/10
CPCC22C1/051C22C29/005C22C29/067C22C29/08
Inventor 谢贤建杨守柱陈琳
Owner 广汉鸿达硬质合金有限责任公司